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9000 watts 12 s (12 x 12 volt= 144volts power system

Old 03-16-2009, 12:19 AM
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capn chaos
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Default 9000 watts 12 s (12 x 12 volt= 144volts power system

On another thread here 'what (Watt) do you do to pay RC bills..listed my occupation as marine surveyor and inspector...Will be aboard this boat on Friday for inspection ([media]http://solomontechnologies.com/picts/marine/cat_port792.jpg[/media]. Something looks familiar here.
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Old 03-16-2009, 12:23 AM
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firemanbill
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Now that looks CooL!

I'd like to get a look at that dude. Take some pics if you can and post em up!
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Old 03-16-2009, 12:28 AM
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Will copy that, Bill, should be intersting...sent the buyer the link here because he's new to electric power and you guys have been doing this along time. An intersting note here and maybe someone here can fill me in on the tech end...when this boat is under sail, the free spooling props become generators that recharge the 12 s pack. Probably why there are two motor controllers for each engine. if this is the case then the props are probably more "square" than we are used to seeing ie 12 x 12 or 6 x 6 etc. so that the flow is more conducive to spinning them underway.

PS I dont think this thing will ever get off the ground....lol

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Old 03-16-2009, 07:25 AM
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Larry3215
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I wonder if the props would be variable pitch? Seems like it would be a lot of drag under sail - especially if used to charge the packs. That takes energy.
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Old 03-16-2009, 09:57 AM
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Originally Posted by Larry3215 View Post
I wonder if the props would be variable pitch? Seems like it would be a lot of drag under sail - especially if used to charge the packs. That takes energy.
That is interesting Huh Larry, Well all of the Submarines during WWII were electric power, using diesel or gas engines for the generators to charge up the batteries with, I think you are right, it may be a combination of variable pitch prop and a limiter on the amount the motors can generate to electricity or there would be a lot of drag there,


http://www.solomontechnologies.com/wheel.htm


http://www.solomontechnologies.com/miami_show_big.htm
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Old 03-16-2009, 07:40 PM
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Nifty stuff for sure.

Its important to keep some perspective though. 9000 watts sounds like a lot to us in the RC world.

However, thats only about 12 horse power. Not much when it comes to moving a large boat
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Old 03-16-2009, 07:50 PM
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Understand the implied restrictions but also understand the efficiency of electric over internal combustion. More than horsepower issues for this particular boat is the weight of the batterys systme which I have estimated to be 2000-2500 lbs. Not your standard lipo option here. The acutal hull form is quite 'slippery and requires very little to push it through the water typically (multihulls use about 70% of working sail area as compared to monohulls but rigs are more effectie also.) Apparently the boat is supposed to cruise at 9 knots (11 mph) at 60% power which is typical of a twin 30hp diesel propulsion at 80% power..Seatrial will prove that....or not! I do appreciate the feedback! I will post some pics as per Firemanbill's suggestion and will keep you posted.
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